The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

It's possible to estimate when it's possible to plant pyrethrum by checking out the USDA zone info for Oskaloosa.

Planting Calendar for Pyrethrum

Frost tolerance for pyrethrum:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Pyrethrum do ok in mild cold which means that you can plant them a little earlier in the year than other plants that might not handle the cold.

The earliest that you can plant pyrethrum in Oskaloosa is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant pyrethrum and expect a good harvest is probably September. Any later than that and your pyrethrum may not have a chance to really do well. Starting your pyrethrum indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Oskaloosa. In the coldest months of winter you can expect an average low temperature of -15°F.

Since the USDA zone info for Oskaloosa is an average the actual date of last frost is different every year. Since half of the time in Oskaloosa there is a last frost after April 15 be ready to cover your pyrethrum if you have a late frost.

USDA Zone Info for Oskaloosa

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Oskaloosa

You may be interested in your other planting guides for Oskaloosa.